Gently exfoliate your lips with a soft toothbrush or a sugar-and-honey scrub before bed
Apply a thick layer of petroleum jelly, lanolin, or a fragrance-free lip balm overnight
Drink enough water throughout the day to keep lips hydrated
Avoid licking, biting, or peeling your lips
Remove lipstick and lip stains completely before sleeping
Use a humidifier in your room if the air is dry
Apply a lip balm with SPF during the day to prevent darkening
Avoid smoking and excess caffeine
Use a mild lip mask or overnight lip treatment
Eat a balanced diet rich in iron, vitamin B12, and folate
If lip darkening is persistent or sudden, consult a dermatologist